What could happen?

I'm sure nothing can go wrong with this. I saw a scientist on the History Channel talking about the LHC and how the risk is minimal because mini black holes evaporate much to quickly and eat to slowly to be a danger. This comforted me for about the expected lifespan of a mini-black hole until I realized no one has ever actually observed one and measured its lifespan or how fast it eats including the guy telling me all this in great detail. All speculation is based on theory and theories are never wrong, right? If we new definitively how mini-black holes worked we probably would not need the LHC to tell us that. Well, if they are wrong at least we may get the answer to another question, why no other intelligent life has been detected given the predictions of Drake's equation.